Tire-building machine



ma 28, 2929 GFVWKLE v wmvaaz TIRE BUILDING MACHINE Filed June 15, r9215 2 sheets-sheet 1 George f? M/r/e In ven for W i929 v a F. WIKLE TIRE BUILDING MACHINE Filed June 15, 1925 2 Sheets-Sheet 2 George FTWIk/e lnvenfor' Patented May 28, 1929.

' UNITED STATES GEORGE F. WIKLE, OF MILWAUKEE, WISCONSIN, ASSIGN'OR TO THE FISK RUBIBE'R COMPANY, OF CHICOIPEE FALLS, MASSACHUSETTS, A CORPORATION OF MASSACHU- SETTS.

TIRE-BUILDING MACHINE.

Application filed June 15, 1925. Serial No. 37,225.

This invention relates to machines for building pneumatic tire casings and more particularly to a device for uniting the edge of the side wall strip and the tread rubber.

In the manufacture of pneumatic tire casings it is customary to form the carcass upon a building core. The carcass is composed of the required number of plies 0t rubberized fabric, square woven or cord, to whichare added the trend and the strip of side wall rubber. The latter strips overlap the edges of the tread strips and it is the object of this invention to provide means for uniting the sidewall and tread at this point in a manner to seal the overlap against the entrance of soapstone during subsequent operations and make the line of juncture of sidewall and tread uniform in. appearance. .This latter requirement is of especial importance where the tread and sidewall differ in color. Other and further objects will be apparent from the following specification and claims.

In the accompanying drawings which illustrate one embodiment of my invention Figure l is a plan view showing the device attached to one of the building instrumentalities of a tire building machine,

Figure 2 is'a diagrammatical side view showing the device in relation to hat portion olj he casing upon which it operates,

Figure 3 is a detail or the. adjustable mounting, and

Figures 4 and 5 are diagrammatic sections of a casing showing the overlap before and after the operation of, the device. I

Referring to the drawings, the device comprises rolls 1 mounted with theiraxis parallel to but above the plane passing through the axis and the horizontal diameter of the building core. The rolls may be supported in any suitable manner. In Figure 1 they are shown supported on arms 2 of the folding mechanism shown in my co-pending application Serial N umber 705,377 filed April 9, 1924, Patent 1,647,165, Nov. 1, 1927, and movable therewith into operative relation to thecore 7. As shown in Figure l, lugs 3, having extending cylindrical projections 4;, are formed on arms 2. The rolls 1 are rotatably mounted on shafts 6 secured in bosses 8' formed integral with a split ,collar 9 adapted to be adjust-ably positioned on pro- 2,;j80tl0115 4i and held thereon in desired posi- Jtion'by machine bolt 10. It will be understood' that I do not limit myself to the shafts.

specific mounting just described and that the rolls 2 may be supported in any other suit.-

able manner. I

As shown in the figures the rolls are formed with curved faces 12. The rolls are so formed for greater ease in adjusting the rolls to different curvatures of the tire section' and different sizes of tires. If desired the rolls may have a cylindrical form as shown in dotted lines in Figure 2. As shown in the latter figure the axis a-La of the.

rolls 1 are spaced a distance X above, but

parallel-to, the plane passing through the axis and the horizontal diameter b-i of the core. The rolls 1. mayobviously be positioned against the sidewall and tread overlap at any convenient point about the core circumference but the specified arallel offset relations to a plane passing through a diameter of the core is an essential feature of my invention. It will be obvious that, While in the position of rolls 1 illustrated theaxes aa lie above plane b-b, if the rolls were to be placed in a diametrically opposite position with respect to the core'annulus, the axes H would lie below-plane b-b. The

essential feature is the relative positions shown, that is, that the axes a-a shall be spaced from the plane 5-?) in the direction forcibly pressed against the rotating core with the cas1 n'g thereon are rotated on their Besides the direct flattening pressure to overlap 18 the rolls, due to their offset position with respect to the axis of the core, have a further action illustrated bythe force diagram shown by the arrows in Figure 2. The arrow 0 shows substanthe roll-is operating, in particuar.v The motion imparted. to the roll is of course about, and. in a plane perpendicular to, its own axis and its direction may be illustrated by arrow at. The resultant is a component of motion in the direction of the arrow "ti'ally the direction of rotation of the core in general and of the overlap 18, u on which e. The relative position of the core and roll being fixed this motion takesplace as a slip or drag on the surface of the casing, tending to drag the sidewall over the tread and producing the smooth uniform overlap of sidewall and tread shown diagrammatically in Figure 5, at 19. The amount of drag produced is obviously proportional to the distance X, being zero when the axis (Iaa of the rolls 1 lie in the plane b?) and reaching a maximum when'the rolls 1 are positioned at the top of the core with their axis parallel to the plane passing through the diameter Z)?) and the axis of the core but spaced therefrom a distance substantially equal to the core radius, in which position no rotation would be imparted to the rolls 1. The amount of drag desired, and'therefore the spacing X, depends upon the thickness and character of the sidewall rubber strip. 1 1

Having described one embodiment of my invention, I claim: 1. In a tire building machine including a rotatable core, a device for uniting the ed es of the tread and side wall rubber compr1sing a freely rotatable roll adapted to a p and a diameter of the core and spaced from i said plane in the direction of the rotation of the core 1 2. In a tire building machine including a rotatable core, a device for uniting the edges of the tread and side wall rubber comprising a freely rotatable convex roll adapt ed to be brought into contact with a tire casing, supported on the core, at the point where the tread and side wall overlap; the axis of the roll being substantially parallel to a plane passing throu h the axis of rotation and a diameter of ta core and spaced from said plane in the direction of the r0- tation of the core.

In testimon whereof I have signed my name to the a ove specification.

. GEORGE F. WIKLE. 

